Makes: 12 slices
Preparation time: 15 minutes
Cooking time: 40 minutes
- 250g self-raising flour
- 45ml (3 tbsp) cocoa powder
- 5ml (1 tsp) bicarbonate of soda
- 150g soft brown sugar
- 150g butter
- 200ml Diet Coke
- 150ml buttermilk
- 2 medium eggs
- 5ml (1 tsp) vanilla extract
For the frosting:
- 100g plain chocolate (70% cocoa), broken into pieces
- 45ml (3 tbsp) Diet Coke
- 45ml (3 tbsp) buttermilk
- Preheat the oven to 180°C, gas mark 4. Grease a 20.5cm loose-bottomed, spring release cake tin and line the base with baking paper.
- Sift the flour, cocoa powder and bicarbonate into a bowl. Stir in the sugar.
- Put the butter in a saucepan and melt over gentle heat. Add the Diet Coke to the butter and stir to mix, making sure mixture does not boil. Remove from the heat.
- Beat together the buttermilk, eggs and vanilla extract.
- Quickly whisk the cola mixture into the dry ingredients, then whisk in the buttermilk mixture. Mix gently but thoroughly.
- Pour the mixture into the prepared tin. Bake for about 40 minutes or until a skewer inserted into the centre comes out clean.
- Leave to cool in the tin for about 15 minutes, then turn out onto a cooling rack.
- To make frosting, place the chocolate and Diet Coke in a saucepan. Cook over a gentle heat, stirring until the chocolate has dissolved. Remove from the heat and stir in the buttermilk. Place the cake on a plate and spoon over the chocolate mixture. Allow to set.
Nutritional info per slice:
Saturated fat: 8.8g
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